This issue of Evidence Matters examines fair housing and housing discrimination, particularly from an enforcement perspective. The lead article, “Expanding Opportunity Through Fair Housing Choice,” discusses the progress that has been made in reducing overt discrimination while recognizing the consequences of more persistent and subtle forms of discrimination as well as continuing segregation. “Paired Testing and the Housing Discrimination Studies,” the Research Spotlight article, focuses on the methodology of HUD’s Housing Discrimination Studies, which have for decades provided critical insight into the state of fair housing in the United States. Finally, the In Practice article, “Fair Housing Enforcement Organizations Use Testing To Expose Discrimination,” profiles three nonprofits working to prevent and expose discrimination and advocate for equal housing opportunities.